Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fcc7a2d4e0e4f8…

MALICIOUS

PDF

101.8 KB Created: 2021-09-06 12:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cc0559ca2968b82e5845e34126d0496 SHA-1: 9cbc64dab8baefc7aa23c9989136e33514da658f SHA-256: b3fcc7a2d4e0e4f82fb7133c740be99a623f9d4189d287099cc65029001998cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The document leverages SEO poisoning and links to compromised websites, including WordPress upload directories, to host further malicious PDFs. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lesfeesdelhetre.fr/upload/files/kunibenipurototadiv.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131ada4b9ff4---1494373753.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/97f427ac4b8d52497d7496768d218ab8/fegawedibodofowuxa.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7d62e0372---mazupaxobefufazixu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0fc927c9---35960163125.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/watitunat.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zagebavatapa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae0c5c3ac---ligifobebevilu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/85s6bltagjho68c16pg461gbd4/tupezowixegubuzub.pdfIn PDF document text
    • http://starma.pl/files/file/70253619780.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/tosurovokuvomuwekavejo.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/87074540931.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f508ff4517ac326dc797420482b9b54a/80514389229.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ebe2f2c97c6fdadee43b6aef221a0b72/19120004775.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/30412822006.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a0af0b80---30456426194.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/pitatugegewi.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/47716996517.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608139c76b2a4---33266641722.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/85040899506.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/tebofonu.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/38167892782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=excel+2010+formulas+with+examples+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/18228266558.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 18548 bytes
SHA-256: 5ac8c2ebdfae0225ae1c7fc5067315c4c6c9b89ae40e5bec2d2d218056763210
font_01_sfnt_off00015657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6E 11344 bytes
SHA-256: 9150f990909e6414acfc9c343999ef054de64eac15155d8f359a74977bfefbbf

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